I would like to inform you that I have no intention of giving you up, in addition I can also assure you that I will neither let you down or turn around and hurt you. Furthermore, I will also refrain from making you cry, saying goodbye, or deserting you.
-Rick Astley

You need to break up with that guy. I was with a guy like that. Took 3 months of me telling him it was over before he finally left me alone. Telling him I slept with some guy on his bday helped get rid of him :)